. Bulletins of American paleontology. 500 - L c c 400 300 - 1 L^B L B B L B B C 200 p p B h B C 100 0 B 4 6 Age (Ma) 10 12 Text-figure 18.—Ordination plots (A, B) of 126 PPP collections (Table 1) on three axes obtained by detrended correspondence anal- ysis (DCA) of abundances (counted as explained in text) of 160 cheilostome species; and (C) relationship between the ages of col- lections and their scores on DCA axis 1. X to < O Q CO (0 x < O Q X (0 < O Q 500 400 300 200 100 C Rio Cana A C G Rio Gurabo q, M Rio Mao Y Rio Yaque e - w CO? ^" ;^ccc ' ^ ^ Y^ S°*^ « G mTO ^GGC G G M U
. Bulletins of American paleontology. 500 - L c c 400 300 - 1 L^B L B B L B B C 200 p p B h B C 100 0 B 4 6 Age (Ma) 10 12 Text-figure 18.—Ordination plots (A, B) of 126 PPP collections (Table 1) on three axes obtained by detrended correspondence anal- ysis (DCA) of abundances (counted as explained in text) of 160 cheilostome species; and (C) relationship between the ages of col- lections and their scores on DCA axis 1. X to < O Q CO (0 x < O Q X (0 < O Q 500 400 300 200 100 C Rio Cana A C G Rio Gurabo q, M Rio Mao Y Rio Yaque e - w CO? ^" ;^ccc ' ^ ^ Y^ S°*^ « G mTO ^GGC G G M UKPSfe, G M li^waff; Wg 1 1 1 1 1 1 1 400 300- 200 100- 0- 600- 400- 200- 200 400 DCA axis 1 600 B - i \\/'' ° lufifS^ Cr G G „ ^g^G4 G° g ^ Y Wk^ GGG G ^«%5 G G G XY (^ G Y^ ^ - Y Y G 1 200 400 DCA axis 1 600. Age (Ma) Text-figure 19.—Ordination plots (A, B) of 117 DR collections (Table 2) on three axes obtained by detrended correspondence anal- ysis (DCA) of abundances (counted as explained in text) of 120 cheilostome species; and (C) relationship between the ages of col- lections and their scores on DCA axis 1. linear interpolation based on stratigraphic thickness between biostratigraphic markers (Saunders et al., 1986; Cheetham, 1986). For the PPP collections, mid- points of age range estimates are from Coates (in Jack- son et Appendix 1, this volume; written commun., 1998); paleodepths are midpoints of depth ranges based on benthic foraminiferal data (Collins et 1995; Collins et al., this volume; Collins in Jackson et Appendix 1, this volume). Highly significant correlations with age (Table 5) suggest that the arrangement on DCA axis 1 in both cases is strongly controlled by temporal changes in species composition and abundance (Text-figs. 18C, 19C). However, the correlation is far stronger for the DR () than for the PPP (; with the three. Please note that these images are extracted from scanned page images that may have been digitally en
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